TY  - JOUR
AU  - Vitalii V. Arestov
TI  - On the best approximation of the differentiation operator
JO  - Ural mathematical journal
PY  - 2015
SP  - 20
EP  - 29
VL  - 1
IS  - 1
UR  - http://geodesic.mathdoc.fr/item/UMJ_2015_1_1_a1/
LA  - en
ID  - UMJ_2015_1_1_a1
ER  -